feat(fips): update keystore to use crypto/pbkdf2 in go 1.24

[kruskall]

What does this PR do?

the keystore is not used in fips mode but importing the pkg is causing x/crypto to be linked in the final binary. We can't drop go 1.23 so just add build tags to use stdlib crypto/pbkdf2 if the app is on go 1.24 (which is required for fips anyway).

Why is it important?

users of this library are importing x/crypto which is linked in the final binary due to this

x/crypto usage should be remove in fips mode

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works

Author's Checklist

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Related issues

[elasticmachine]

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